Electrically-controlled power-cut-out safety device



flct. 3 0 1923. 1,472,232

G. GALPIN ET AL ELECTRICALLY CONTROLLED POWER CUT-OUT SAFETY DEVICE Original Filed May 18, 1918 2 Sheets-finest 1 GEORGE GALPN & DAVID HBAER.

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Oct. 30 1923.

G. GALPIN ET AL ELECTRICALLY CONTROLLED POWER CUT*OUT SAFETY DEVICE Original Filed May 18, 1918 2 Sheets-Sheet 2 Swwewtow. GEORGE GALPsN 8:.

DAvm I'LBAER.

Patented Oct. 30, 1923.

UNITED STATES PATENT OFFICE.

GEORGE GALPIN AND DAVID H. BAER, OE DETROIT, MICHIGAN, ASSIGNORS TO MOR- GAN & WRIGHT, A CORPORATION OF MICHIGAN.

ELECTRIG ALLY -CONTROLLED POWER-GUT-OUT SAFETY DEVICE.

- Original application filed May 18,1918, Serial No. 235,304, Divided and this application filed August V 21, 1922. Serial No. 583,193.

To all whom z't may concern:

Be 'it known that we, GEORGE GALPIN, a citizen of the United States, and DAVID H.

BAER, a subject of the King of Great- "Britain, both residing at Detroit, county of Wayne, and- State of Michigan, have invented; certain new and useful Improvements in Electrically-Controlled Power- Cut-Out SafetyDevices, of which the following is a full, clear, and exact description;

.The' invention has for its obj ect to provide a safety device adapted for a train of -machines, whereby theoperator of any one .machine vmay instantly stop the train of machines in case of accident in the operation of any one of them. For. example,

crushing, grinding, or mixing rolls driven from a common power unit. If an accident happens in the operation of a machlne,

' any of the operators will be enabled to in-' stantly stop the rolls and prevent injury,

a lever on 'or near each machine. This application is a division of our prior application Serial No. 235,304, filed May 18th, 1918, now Patent No. 1,433,809, granted October 31st, 1922.

The apparatus consists of a driving member common to the machine unitsand an electrically controlled driving connection for the said driving member, a switch element for each machine unit, and a relay,

the switch elements and relay being in circuit with the electricalcontrol dev1ce.

nection may be an automatic cut-out switch for the motor or engine, a clutchor equivalent mechanism for connecting anddisconnecting a drivingshaft common to the machine units from the source of power,"or merely a motor incircuit with the switches and relay, as inthe construction illustrated in the drawings.

In the embodiment of'the invention illustrated in the drawings, a'seriesof machine units are-Ioperatively connected with a common driving shaft, :the latter being geared to the motor shaft, the'motor shaft being provided with a-brake device. Each machine unit is. provided with a switch in circuit with the source of current leadingto the motor and also incircuit with the relay. The operator of any one machine unit may, by disconnecting his switch, shut off current to themotor, permit theengagement of the brake to stop the rotation of the driving shaft, and also open the relay. The function of the relay is to prevent any operator from carelessly starting up the 'broken through the solenoid. the invention may be applied to a train of 1 'The invention may be understood by reference to the accompanying drawings, in which 1 Fig. 1 is a front elevation of a machine unit provided with a switch and operating .mean's therefor, and orfurther injury, andthis by movement of r Fig. 2 is a sectional end view of the same.

Fig. 3 is a detail sectional view illustrating a frictional grip for the switch operating shaft.

Fig. 4: is a sectional end elevation of the relay, and i Fig. 5 is a sectional side elevation of the same.

Fig. 6 is a diagrammatic view illustrating the wiring.

The diagrammatic plan in Fig. v6 of the drawings. illustrates a series of machines A equipped with the improvement, the ma- The electrically .c0ntrolled driving con-- .4, 5,,.the said feed wires being connected by means of master switch 6 with the wires 7 and'8,"the latter wire being connected to a terminal of the motor 3 via the resistance l coil 9. Wire 7 leads to 'a switch B on or connected" to the outermost machine, each machine being provided with a similar swltch'in circuit with the motor, the switch on .the machine-nearest. the motor having a terminal connected with a reslstance C011 10", the latter in turn being in circuit through wire 7? with a relayiC, the relay being in circuit through wire 8* with. a b ake Op iaf struction. In Fig. 1 ofthe drawings weh have illustrated one of the switchessecured to one oftwo bracket arms 12"ris ing'from the frame work ofamixi-ng machine having,

the rolls 131 The bracket arms 12 support between them; in the bosses l4 an'oscillatory shaft 15 having an arm 16 in. engagement with a projecting member 17 of the switch operating 'arm' 18; :Inits' positionillustrated in Fig. 1, the member 17 rest-slupon arm .16 and thusse rves' to hold switch arm hold the switch closed. Byimparting a slight turning movement to shaft" 15, however, arm 16 may'b withdrawn from mem-- ber 17 to permit the descent ofswitch arm 18 and the opening'of-th e switch.- Byrd: erence to Fig. 2, it will be seenz that shaft 15 may be given aturning movement from either side of the machine by manipulation of one of two rods 19, each "of which serves to connect two spaced arms 20 clamped upon theshaftl5f To frictionally'hold the shaft 15 in any position to which it may be-m0ved,-'one'or both of the bosses 14 may'beprovided with an enlarged recess 21 surrounding the shaft 15, to receive an expanding washer 22 intermediate the rings 23, the'washer being expanded by the pressure of a' screw,-the latter being threaded in the said boss and having a thumb piece 241 For elevating'the switch rod 18 to close the switch and return'the contact member 17 in position fo r"'engag'e ment by arm 16, a lever 25 may be fulcrumed upon the switch housing to engage the inner end of contact member 17, asillustrated in FigfQ. H

The relay comprises a main casing \C and a solenoid casing C". In'the main casing is mounted for vertical movement arod 25' which carries an insulating block" 26: Se-.

position, the'contact pieces are heldiin :firm

contact with the terminal contacts'a'b by p a spring 29 surrounding the rod below the insulating block 26' and supported upon a l h 4 K =mon'and do not'require further descrlption washer 30 held in position by a pin"3 1.

' The terminal contact a hasa-reducedstem which passes'through an insulating bushing 32 fitted in the cover D'.- of the -'casing,?and' its upper end'is threaded to receive suitable binding nuts for the wire 8" leading tothe brake and motor assembly: Theterininal end'of an insulating bushing 33 in the cover and is electrically connectedwithi' its binding post after wire'7", througlrwire'gg-the solenoid in casing C, and wire- 35, binding 1 post a being threaded in the upper end of 38 rising from the cover D, The lever 36, lIlturn, s operatlvely connected with a rod 39 connected with the solenoid core 40. The

actiongofthe solenoid is' to normallyhold the core lO lll tlle position shown in Fig. 5. However, when the circuit is broken by the openmg of any one of the'switches B, the rod gs 'fiti'l'd contacts carried thereby will-fiall byigravity and the core l0 will be raised 18in its uppermost position, and thus totosucha height as not to fbe operatively affected by the re-energizing of thev solenoid wine-ling;- by th closing oft'he openswitch B. The arrangement is such that rod 25' must be manuanylifted to again move the *co're -10 to 'position where the solenoid is again effective to hol'd the contacts in en- -ing 'mechanismmay be made of a standard i s1ze,-and the levers may be lowered or raised for differentsized machines. To this end the levers arecla'mped within sleeves 42:0n shaftxlfiby means oii'the set screws 43, which permit t-heaforesaid adjustments Thearrangementofyrods and levers 19, 20, provides easy switch opening means within the reach oftheoperator atboth sides of. each machine and throughout the length of the latter. -Therelay'isdesigned to be in stalled at a point-distant from the machines and undertlie control of a responsible person in charge-thereoiti In the claims, the term drlving connection, defines anyintermediary between the J source of power and the machine drive shaft, such, for example, as themotor and brake illustrated in'the drawings, or a clutch between the motor or any driving device and themachin e drive shaft. employed, it may be ofthe usualinagnetic typeiniaintained' in engaged position by the current-and free for. movement to disen- "gaged position by springs or other devices upon the. openingofthe circuit at the switch and an Such clutchmenibers are C0111- 1 ployed "if the operating connections, in themselves, between the" motor and the rolls of fthemachine, act jsufficiently well to rapidly -slow down the rotationr'of therolls'.

Having thusfdescribed our invention,

A contact I) has a stem threaded inthe lower When a clutch is what we claim and :desire to-protect by Let iters Patent-is: 1.

15 n assessin sena e; d scribed, a. driving member for a machine,-'a driving connection" between 'said':driving member and a source of power, a switch, a relay, and an electrical connection between the driving connection, the switch and the relay, whereby opening of the switch will open the relay and act upon the driving connectionto stop the driving member.

2. In devices of the character described,

a driving member for a machine, a driving connection between said driving member and a source of power, a switch, a relay, and an electrical connection between the driving connection, the switch and the relay, wherebyopening of the switch will open the relay and act upon the driving connection to stop the driving member, and closing of the switch is ineffective to close the relay.

3. In devices of the character described, a driving member for a machine, a driving connection between said driving member and a source of power, a switch, a relay, and an electrical connection between the driving connection, the switch and the relay, whereby opening of the switch will open the relay and act upon the driving connection to stop the driving member, and manual closing of both switch and relay is necessary to re-establish circuit through said electrical connection.

4:. An electrical safety cut-out device adapted to be operated from any one of a plurality of machines, comprising a driving member for the machines, an electrically controlled connection between said driving member and a source of power, a switch for each machine, a relay, an electrical connection between said controlled connection, the switches and the relay, whereby the opening of any switch will act upon the controlled connection to stop said driving member, said relay being adapted to prevent the re-establishment of a circuit through said electri cal connection by the closing of the switch.

5. An electrical safety cut'out device adaptcd'to be operated from any one of a plurality of machines, comprising a driving member for the machines, an electrically controlled connection between said driving member and a source of power, a switch for each machine having a contact member movable to open'position entirely by gravity, a relay, an electrical connection between said controlled connection, the switches, and the relay, an arm disengageably and directly supporting the contact member of each switch in closed position, and manually operable means adjacent each machine to which each of said arms is fixed for disengaging it from the contact member whereby the latte may be freed entirely from the supporting member for the machines, an electrically controlled connection between said driving member and a source of power, a switch for each machine having stationary and mov able contactmembers, a relay, an electrical connection between said controlled connec tion, the switches, and the relay, means for sustaining said movable contact member of each switch in position against the stationary contact member including a trip independent thereof, and means for moving any trip to free any movable contact member therefrom and unto the action of gravity whereby the circuit may be quickly opened.

7. In a device of the character described, a driving member for a machine, a driving connection between said driving member and a source of power, a switch, electrical connections between the driving connection and the switch, in combination with a device for opening the switch located within reach of an operator anywhere about the machine while in attendance thereupon.

8. The combination with a machine having a pair of rolls and standards, of a handoperable shaft extending from one standard to the other and within reach of an operator on either side of the rolls, a motor, operating connections between the motor and the rolls of the machine, a brake adapted when applied to arrest movement of the rolls, connections between said shaft, the motor and the brake, for stopping the rolls in emergencies by actuation of said handoperable shaft.

Signed at Muskegon, county of Muskegon, and State of Wichigan, this 17 day of August, 1922.

GEORGE GALPIN. Signed at Detroit, county of Wayne, and State of Michigan, this 29 day of July, 1922.

DAVID H. BAER.

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